Open Context reviews, edits, and publishes archaeological research data and archives data with university-backed repositories, including the California Digital Library.

An international digital repository for the digital records of archaeological investigations.

A collection of UN Reports on a variety of development topics. Also check the UN Statistical Commission for data on a variety of social indicators

Provides access to a variety of key indicators and and raw data on education, literacy, and science and technology.

Vital stats and context/socioeconomic data. Data collected every 10 yrs; non-census years its often hard to get more detailed info. Most online data is from the 1990 and 2000 censuses, but there is some historical data in some areas. Information can be viewed at the state level.